Abstract：
:Sonic crystals are artificial structures consisting of a periodic array of acoustic scatterers embedded in a homogeneous matrix material, with a usually large impedance mismatch between the two materials. They exhibit strong sound attenuation at selective frequency bands due to the interference of multiply reflected waves. However, sound attenuation bands in the audible range are only achieved by unfunctionally large sonic crystals. If local resonators are used instead of simple scatterers, the frequencies of the attenuation bands can be reduced by about two orders of magnitude. In the present paper we perform numerical simulations of acoustic wave propagation through sonic crystals consisting of local resonators using the local interaction simulation approach (LISA). Three strong attenuation bands are found at frequencies between 0.3 and 6.0 kHz, which do not depend on the periodicity of the crystal. The results are in good qualitative agreement with experimental data. We analyze the dependence of the resonance frequencies on the structural parameters of the local resonators in order to create a tool for design and optimization of any kind of sonic crystal.
journal_name
Ultrasonicsjournal_title
Ultrasonicsauthors
Hirsekorn M,Delsanto PP,Batra NK,Matic Pdoi
10.1016/j.ultras.2004.01.014subject
Has Abstractpub_date
2004-04-01 00:00:00pages
231-5issue
1-9eissn
0041-624Xissn
1874-9968pii
S0041624X04000216journal_volume
42pub_type
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